<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>范例</title>
<style>
div{font-size:20px;}

.box1{width:100px;height:100px; background:red;}
.box2{width:100px;height:100px;background:blue;}
.box3{width:100px;height:100px;background:green;}
</style>
</head>

<body>

<div class="box1">div1</div>
<div class="box2">div2</div>
<div class="box3">div3</div>


</body>
</html>
